What a combination of two of very influential languages. In this case, by Randy Beer in 1981 and recently ported to Tandy Basic by Nino Ivanov.
From the Readme:
The source I used was this:
The issues of March and April of this magazine (particularly March) were the original publishing place of his code:
And here’s Randall Beer himself:
Note that the listing has all optional spaces removed so that I could fit both the interpreter and 1100 (!) cons cells into 16K (!!) of memory
via the discussion on HN